The Sun has a mass of 2 x 10³⁰kilograms.
90% of it is hydrogen.
Thus amount of hydrogen is 1.8 x 10³⁰ kilograms.
10% of Hydrogen is 1.8 x 10²⁹ kilograms
At a rate of 6 x 10¹¹ kilograms per second, the time would be
3 x 10¹⁷ seconds
which equals 9.5 billion years
 
 

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